Question

a girl went to school for 216 days in a full year,
her attendance was 90% .
find out when did the school opened​

Answer 1

Let the total number of days the school was opened be x.

Therefore, by the problem

90% of x = 216

or 90/100 of x = 216

or x = 216 X 100/90 = 240

The answer will be 240.